Question: Which car manufacturer is located in Barcelona?
SPARQL (Wikidata):  select distinct ?sbj where { ?sbj wdt:P159 wd:Q1492 . ?sbj wdt:P31 wd:Q786820 } 
Answer: Balandrás, National Pescara, La Cuadra, Abadal, M.A., Nacional Sitjes vehicles, Siata Española S.A., Actividades Industriales